Little bit of maths:
Portal Odds:
Guardians portal
You have a 5.7% chance of summoning EITHER guardian Jackal or falcon.
Atlantis portal
You have a 14.6% chance of summoning one of the 9x 4* season 2 heroes.
Translates to 3.24% chance of summoning EITHER Wilbur or Proteus.
One desired hero
In terms of the odds of getting one of the desired heroes in a 10x pull:
Guardians: 44.39% chance of getting either falcon OR jackal
Atlantis: 27.76% chance of getting either Proteus OR Wilbur.
Both Desired Heroes
In terms of getting Both the desired heroes on a 10x pull:
Guardians: 5.8% chance of getting BOTH jackal & Falcon
Atlantis: 2.1% chance of getting BOTH wilbur & proteus
Edit:
Thanks @DracoLovesRi for a correction to the “Get Both” heroes maths.
Archive/ Removed Edits
Guardians: 25.11% chance of getting BOTH jackal and falcon
Atlantis: 15.07% chance of getting BOTH Wilbur and Proteus
(Note I’m not as confident with this math… Statistics isn’t my strongest math suite…)